Sealing unit



FIG. 1 is a perspective view of the sealing unit, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is another perspective view of the sealing unit;

FIG. 3 ;is an end elevational view of the sealing unit;

FIG. 4 is an end elevational view of the sealing unit, opposite to the end elevational view in FIG 3;

FIG. 5 is a side elevational view of the sealing unit;

FIG. 6 is a top plan view of the sealing unit;

FIG. 7 is a bottom plan view of the sealing unit; and,

FIG. 8 is a side elevational view of the sealing unit, opposite to the side elevational view in FIG. 5. 

The ornamental design for a sealing unit, as shown and described. 